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THEINTRODUCEOFSOUNDPLAYBACKCHIPISD251201ISD2500SERIESCHIPPROFILEISDS2500SERIESCHIPS,ACCORDINGTORECORDINGTIME60SECONDS,75SECONDS,90SECONDSAND120SECONDSINTOISD2560,2575,2590AND25120FOURMODELSISDDEVICEWITHOVFOVERFLOWCLIENTFORCASCADINGMULTIPLEDEVICESISD2500SERIESEEPROMWITHCAPACITYFOR480K,UPTOSUBPARAGRAPH600FOURDIFFERENTTYPESOFRECORDINGTIMEDEPENDSONDIFFERENTINPUTSAMPLINGRATETOACHIEVE,ANDTHEYWERE80,64,53,40KHZDIPPACKAGE28PINDEVICES,THEPINFUNCTIONASFOLLOWS17A0/M0A6/M6ADDRESS/MODESELECTION810A7A9ENTERANADDRESSLINE11AUXININPUT12,13VSSD,VSSAANDANALOGTODIGITAL14,15SP,SPSPEAKEROUTPUT16VCCAPOWERANALOGSIGNALPOSITIVE17,18MIC,MICREFMICROPHONEINPUTANDTHEINPUTREFERENCETERMINAL19AGCAGC20,21ANAIN,ANAOUTANALOGSIGNALINPUTANDOUTPUTSPILLAGE22OUF23CECHIPSELECTLOWTOALLOWTHECHIPWORK24PDCHIPLOWPOWERSTATECONTROL25EOMANENDAUDIOPLAYBACKSIGNALOUTPUT26XCLKEXTERNALCLOCK27P/RRECORDED/RELEASECONTROLTOCHOOSE28VCCDCATHODEPOWERSUPPLYDIGITALSIGNAL2WORKINGPRINCIPLE2500SERIES10INPUTADDRESSA0A9,THESITERECORDEDUPTO1024,ADDRESSSPACEIS01023ITSDISTRIBUTIONISADDRESS0299ASASUB,ANDDIDNOTADDRESSTHEUSEOF600767,7681023FORTHEADDRESSMODESELECTIONIE,A8,A9AREHIGHADDRESSLINE2500SERIESHASTWOPURPOSES,FIRSTASAMODEOFCONTROL,THESECONDSUBRECORDINGSOUNDASTHESTARTSEGMENTADDRESSWHENTHEHIGHESTADDRESSBITMSBA8,A9AREHIGHIEADDRESS7681023,THEADDRESSA0A6SIDEASAWORKINGMODELONTHECHOICEOFCLIENTM0M6,CORRESPONDINGTOSEVENKINDSOFWORKWHENTHEA8,A9ORANYONEFORTHELOWLOWTHATIS,ADDRESS0599,ASLONGASRECORDEDINTHESUB/PLAYBACKPREOPERATIONLESSTHAN300NSTOTHEADDRESSA0A9ASSIGNMENTOPERATIONFROMTHEADDRESSTOSTART2500SERIESOFVOICECHIPSWILLBEDIVIDEDINTO480KOFEEPROMINFORMATIONINPARAGRAPH600,800BYTESEACHUNITASAWHOLE,ADDRESSINGANDCONTROLINFORMATIONTOEACHPARAGRAPHSHOULDBEASSIGNEDANADDRESSFORTHEEXTERNALCONTROLRATHERTHANFOREACHBYTEADDRESSING,ORATLEASTADDRESSPORT19THISGREATLYREDUCESTHEINFORMATIONNEEDEDTORETRIEVETHEADDRESSLINEOFTHESPEECHSIGNALCANBEALONGCROSSSECTIONOFANUMBEROFINFORMATIONRECORDING,STORAGEINFORMATIONFROMTHESECTIONOFTHEINTERNALCONSTRAINTS,ANDINFORMATIONWITHINTHESITEWILLAUTOMATICALLYINCREASETHESEGMENTEACHVOICEINTHEAUTOMATICINCREASEINTHETAILSECTIONOFANENDMARKEOM,WHENTHECOMBINATIONOFPLAYING,BYDETECTINGEOMTOCONTROLTHEENDOFTHEVOICESEGMENTANDTHEBEGINNINGOFTHENEXTSECTIONINFORMATIONSECTIONOFEACHAUDIOPLAYBACKTIMEEQUALTOTHETOTALTIMEDIVIDEDBY600ISD2560,SUCHASTHETOTALTIMEFORTHE60S,THEINFORMATIONSECTIONOFEACHAUDIOPLAYBACKTIMEOF100MS；ISD25120THETOTALTIMEFORTHE120S,EACHTIMEFORPARAGRAPHINFORMATION200MSTHEREFORETHELENGTHOFTIMECANBEUSEDASASEGMENTADDRESS,THROUGHTHETIMEPARALLELSINGLECHIPTIMERTOTHEADDRESSABOVEMAPPINGINFORMATIONINORDERTOGETTHESTARTADDRESSOFEACHRECORDINGINTHISWAY,ONTHENEEDTOSETUPANADDRESSCOUNTERGENERALADDRESSFROM0TOSTARTRECORDING,FIRSTOFALL,THROUGHTHECPUASSIGNEDTOITA0A9,THENSTARTRECORDINGISDSCM,SCMTOSTARTTHETIMERATTHESAMETIMETHEBEGINNINGOFTIME,EVERYTIMEANINFORMATIONPARAGRAPH,GIVETHEADDRESSCOUNTPLUS1ISDSINGLECHIPCONTROLWHENTOSTOPRECORDINGATTHESAMETIMESTOPTHETIMERTIMEATTHISPOINTTHEVALUEOFADDRESSCOUNTERISTHEVOICEOFTHEPARAGRAPHDIDNOTADDRESS,PLUS1UNDERTHESECTIONOFSPEECHISTHEFIRSTADDRESS,ANDEEPROMINITSEXISTENCE,WILLBEPLAYINGFORTHENEXTADDRESSINFORMATIONPROVIDEDTHROUGHTHECPUASSIGNEDTOTHEADDRESSA0A9,UNDERTHESECTIONOFYOURVOICERECORDINGFOLLOWEDIT,YOUCANRECORDVOICEABOVEALLATTHESAMETIMEBETHESTARTINGADDRESSOFTHEPARAGRAPHSIFITISNOTSTARTEDFROM0VOICEABOVEADDRESS,SIMPLYASSIGNTHEINITIALADDRESSA0A9,WITHTHEVALUEOFADDRESSCOUNTERCANBEAVOICEATTHEENDOFTHEADDRESSABOVENOTHEREATTHESAMETIMETOPRESERVETHEVOICESEGMENTSTARTADDRESSANDENDADDRESS,BECAUSEITISADJACENTTOEACHPARAGRAPH,BEFOREPARAGRAPH1ATTHEENDOFTHEADDRESSTHATISTHESTARTINGADDRESSOFTHISPARAGRAPH,ANDEACHHAVEAVOICEATTHEENDOFPARAGRAPHMARKEOMMAYGIVEADISRUPTIONUSEITWHENPLAYINGANDSTOREDINTHEEEPROMINTHEINITIALPARAGRAPHOFTHESPEECHADDRESSINANYORDERCOMBINATIONOFVOICEABOVEALLISD25120录放音芯片介绍1ISD2500系列芯片简介ISD公司的2500系列芯片，按录放时间60秒、75秒、90秒和120秒分成ISD2560、2575、2590和25120四个型号。ISD器件设有OVF（溢出）端，便于多个器件级联。ISD2500系列片内EEPROM容量都为480K，最多能分600段。四个型号的不同录放时间是靠不同的输入采样率来实现的，它们分别为80、64、53、40KHZ。DIP器件封装为28脚，各引脚功能如下1～7A0/M0～A6/M6地址/模式选择8～10A7～A9输入地址线11AUXIN辅助输入12、13VSSD、VSSA数字地和模拟地14、15SP、SP扬声器输出16VCCA模拟信号电源正极17、18MIC、MICREF麦克风输入端和输入参考端19AGC自动增益控制20、21ANAIN、ANAOUT模拟信号输入和输出22OUF溢出23CE片选（低电平允许芯片工作）24PD芯片低功耗状态控制25EOM录放音结束信号输出26XCLK外部时钟27P/R录/放控制选择
